Terminal device, integrated circuit, and communication method

ABSTRACT

In a first case, in which a condition is satisfied that includes at least conditions that at least one scheduling request is pending in a certain TTI, there is no UL-SCH resource available for transmission in the certain TTI, the terminal device has a valid PUCCH resource for the scheduling request configured for the certain TTI, and a serving cell other than a primary cell is deactivated, the terminal device initiates a random access procedure on the primary cell.

TECHNICAL FIELD

The present invention relates to a terminal device, an integratedcircuit, and a communication method.

This application claims priority based on Japanese Patent ApplicationNo. 2015-014738 filed on Jan. 28, 2015, the contents of which areincorporated herein by reference.

BACKGROUND ART

In the 3rd Generation Partnership Project (3GPP), a radio access methodand a radio network for cellular mobile communications (hereinafterreferred to as “Long Term Evolution (LTE)”, or “Evolved UniversalTerrestrial Radio Access (EUTRA)”) have been discussed. In LTE, a basestation device is also referred to as an evolved NodeB (eNodeB), and aterminal device is also referred to as user equipment (UE). LTE is acellular communication system in which an area is divided into aplurality of cells to form a cellular pattern, each of the cells beingserved by a base station device. A single base station device may managea plurality of cells.

LTE supports a time division duplex (TDD). LTE that employs a TDD schemeis also referred to as TD-LTE or LTE TDD. In TDD, an uplink signal and adownlink signal are multiplexed in time division. Furthermore, LTEsupports a frequency division duplex (FDD).

In the 3GPP, a carrier aggregation has been specified where a terminaldevice is capable of simultaneously performing transmission and/orreception in up to five serving cells (component carriers).

In the 3GPP, simultaneous transmission and/or reception by a terminaldevice in over five serving cells (component carriers) has beenconsidered (NPL 1). Furthermore, a terminal device transmits a physicaluplink control channel in a secondary cell that is a serving cell otherthan a primary cell has also been considered (NPL 1).

CITATION LIST Non Patent Literature

NPL 1: “New WI proposal: LTE Carrier Aggregation Enhancement Beyond 5Carriers”, RP-142286, Nokia Corporation, NTT DoCoMo Inc., NokiaNetworks, 3GPP TSG RAN Meeting #66, Hawaii, United States of America,8-11 Dec. 2014.

NPL: 2: “3GPP TS 36.321 v12,4.0 Evolved Universal Terrestrial RadioAccess (E-UTRA); Medium Access Control (MAC) protocol specification”, 5Nov. 2015.

NPL 3: “3GPP TS 36.213 v12.4.0 Evolved Universal Terrestrial RadioAccess (E-UTRA); Physical layer procedures”, 7 Nov. 2015.

SUMMARY OF INVENTION Technical Problem

However, a specific method of transmitting, by a terminal device, ascheduling request to a base station device in a secondary cell that isa serving cell other than a primary cell, when a physical uplink controlchannel is transmitted, has not been sufficiently discussed.

Some aspects of the present invention have been made in view of theabove points, and an object thereof is to provide a terminal devicecapable of effectively communicating with a base station device by usinga plurality of cells (component carriers), an integrated circuit mountedin the terminal device, a communication method used for the terminaldevice, a base station device configured to communicate with theterminal device, an integrated circuit mounted in the base stationdevice, and a communication method used for the base station device.

Solution to Problem

(1) To accomplish the object described above, some aspects of thepresent invention are contrived to provide the following means. That is,a first aspect of the present invention is a terminal device configuredto execute a random access procedure on a first serving cell and arandom access procedure on a second serving cell. The device includes: amedium access control (MAC) layer processing unit configured to (a)increment a value of a counter by 1 and (b) instruct a transmission unitto transmit a scheduling request via a physical uplink control channel,in a first case in which at least conditions are satisfied that at leastone scheduling request is pending in a certain transmission timeinterval (TTI), there are no uplink shared channel (UL-SCH) resourcesavailable for transmission in the certain TTI, and a resource for thephysical uplink control channel for the scheduling request is configuredonly in the second serving cell in the certain TTI, when the secondserving cell is activated and when the value of the counter is smallerthan a prescribed value; and the transmission unit configured totransmit the scheduling request via the physical uplink control channelin the second serving cell. The MAC layer processing unit initiates, inthe first case, when the second serving cell is deactivated, the randomaccess procedure on the first serving cell, out of the first servingcell that is a cell instructed in a handover procedure and the secondserving cell in which the resource for the physical uplink controlchannel for the scheduling request is configured.

(2) A second aspect of the present invention is an integrated circuitmounted in a terminal device, configured to execute a random accessprocedure on a first serving cell and a random access procedure on asecond serving cell. The circuit includes: a medium access control (MAC)layer processing circuit configured to (a) increment a value of acounter by 1 and (b) instruct a transmission circuit to transmit ascheduling request via a physical uplink control channel, in a firstcase in which at least conditions are satisfied that at least onescheduling request is pending in a certain transmission time interval(TTI), there are no uplink shared channel (UL-SCH) resources availablefor transmission in the certain TTI, and a resource for the physicaluplink control channel for the scheduling request is configured only inthe second serving cell in the certain TTI, when the second serving cellis activated and when the value of the counter is smaller than aprescribed value; and the transmission circuit configured to transmitthe scheduling request via the physical uplink control channel in thesecond serving cell. The MAC layer processing circuit initiates, in thefirst case, when the second serving cell is deactivated, the randomaccess procedure on the first serving cell, out of the first servingcell that is a cell instructed in a handover procedure and the secondserving cell in which the resource for the physical uplink controlchannel for the scheduling request is configured.

(3) Furthermore, a third aspect of the present invention is acommunication method used for a terminal device, the method includingthe steps of: executing a random access procedure on a first servingcell and a random access procedure on a second serving cell; (a)incrementing a value of a counter by 1 and (b) instructing transmissionof a scheduling request via a physical uplink control channel, in afirst case in which at least conditions are satisfied that at least onescheduling request is pending in a certain transmission time intervalTED, there are no uplink shared channel (UL-SCH) resources available fortransmission in the certain TTI, and a resource for the physical uplinkcontrol channel for the scheduling request is configured only in thesecond serving cell in the certain TTI, when the second serving cell isactivated and when the value of the counter is smaller than a prescribedvalue; and transmitting the scheduling request via the physical uplinkcontrol channel in the second serving cell. In the first case, when thesecond serving cell is deactivated, the random access procedure on thefirst serving cell, out of the first serving cell that is a cellinstructed in a handover procedure and the second serving cell in Whichthe resource for the physical uplink control channel for the schedulingrequest is configured, is initiated.

Advantageous Effects of Invention

According to some aspects of the present invention, a terminal devicecan effectively communicate with a base station device by using aplurality of cells (component carriers).

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a conceptual diagram of a radio communication system accordingto the present embodiment.

FIG. 2 is a diagram illustrating one example of a PUCCH cell group inthe present embodiment.

FIG. 3 is a diagram illustrating one example of a process involving ascheduling request executed for each of subframes (TTIs), in the presentembodiment.

FIG. 4 is a schematic block diagram illustrating a constitution of aterminal device 1 according to the present embodiment.

FIG. 5 is a schematic block diagram illustrating a constitution of abase station device 3 according to the present embodiment.

DESCRIPTION OF EMBODIMENTS

Embodiments of the present invention will be described below.

FIG. 1 is a conceptual diagram of a radio communication system accordingto the present embodiment. In FIG. 1, the radio communication systemincludes terminal devices 1A to 1C and a base station device 3.Hereinafter, the terminal devices 1A to 1C are each referred to as aterminal device 1.

A carrier aggregation will be described below.

In the present embodiment, a plurality of serving cells are configuredfor the terminal device 1. A technology in which the terminal device 1performs communication via a plurality of serving cells is referred toas cell aggregation or carrier aggregation. The present invention may beapplied to each of the plurality of serving cells configured for theterminal device 1. Furthermore, the present invention may be applied tosome of the plurality of configured serving cells. Furthermore, thepresent invention may be applied to each of groups of the plurality ofconfigured serving cells. Moreover, the present invention may be appliedto some of the groups of the plurality of configured serving cells. Inthe carrier aggregation, the plurality of configured serving cells arereferred as aggregated serving cells.

Time Division Duplex (TDD) and/or Frequency Division Duplex (FDD) areapplied to the radio communication system according to the presentembodiment. In a case of cell aggregation, the TDD may be applied to allof the plurality of serving cells. Furthermore, in a case of cellaggregation, a serving cell to which the TDD is applied and a servingcell to which the FDD is applied may be aggregated.

The plurality of configured serving cells include one primary cell andone or a plurality of secondary cells. The primary cell is a servingcell in which an initial connection establishment procedure has beenperformed, a serving cell in which a connection re-establishmentprocedure has been initiated, or a cell indicated as a primary cellduring a handover procedure. At a point of time when a radio resourcecontrol (RRC) connection is established, or later, a secondary cell maybe configured.

In a downlink, a carrier corresponding to a serving cell is referred toas a downlink component carrier. In an uplink, a carrier correspondingto a serving cell is referred to as an uplink component carrier. Thedownlink component carrier and the uplink component carrier arecollectively referred to as a component carrier.

In a plurality of serving cells (component carriers), the terminaldevice 1 is capable of simultaneous transmission and/or reception on aplurality of physical channels. One physical channel is transmitted inone serving cell (component carrier) out of the plurality of servingcells (component carriers).

In the present embodiment, a secondary cell used for transmitting aphysical uplink control channel (PUCCH) is referred to as a specialsecondary cell or a PUCCH secondary cell. In the present embodiment, asecondary cell not used for transmitting PUCCH is referred to as anon-special secondary cell, a non-PUCCH secondary cell, a non-PUCCHserving cell, or a non-PUCCH cell. The primary cell and the specialsecondary cell are collectively referred to as a PUCCH serving cell, ora PUCCH cell.

The PUCCH serving cell (primary cell, PUCCH secondary cell) includes adownlink component carrier and an uplink component carrier. In the PUCCHserving cell (primary cell, PUCCH secondary cell), a PUCCH resource isconfigured.

The non-PUCCH serving cell (non-PUCCH secondary cell) may include adownlink component carrier only. The non-PUCCH serving cell (non-PUCCHsecondary cell) may include a downlink component carrier and an uplinkcomponent carrier.

In a PUCCH serving cell, the terminal device 1 performs transmission onPUCCH. In a primary cell, the terminal device 1 performs transmission onPUCCH. In a special secondary cell, the terminal device 1 performstransmission on PUCCH. In a non-special secondary cell, the terminaldevice 1 does not perform transmission on PUCCH.

Note that the special secondary cell may be defined as a serving cellthat is neither a primary cell nor a secondary cell.

A physical channel and a physical signal according to the presentembodiment will be described.

In FIG. 1, in uplink radio communication from the terminal device 1 tothe base station device 3, the following uplink physical channels areused. The uplink physical channel is used to transmit information outputfrom a higher layer.

-   -   Physical uplink control channel (PUCCH)    -   Physical uplink shared channel (PUCCH)    -   Physical random access channel (PRACH)

The PUCCH is used to transmit uplink control information (UCI). Theuplink control information includes downlink channel state information(CSI), a scheduling request (SR) used for requesting an uplink-sharedchannel (UL-SCH) (PUSCH) resource for an initial transmission, a hybridautomatic repeat request acknowledgement (HARQ-ACK) for downlink data (atransport block, a medium access control protocol data unit (MAC PDU), adownlink-shared channel (DL-SCH), a physical downlink shared channel(PDSCH)). The HARQ-ACK indicates an acknowledgment (ACK) or anegative-acknowledgment (HACK). The HARQ-ACK is also referred to as anACK/NACK, HARQ feedback, HARQ response, HARQ information, or HARQcontrol information.

The scheduling request includes a positive scheduling request or anegative scheduling request. The positive scheduling request indicatesthat a UL-SCH resource for an initial transmission is requested. Thenegative scheduling request indicates that a UL-SCH resource for aninitial transmission is not requested.

A PUCCH format 1 is used to transmit a positive scheduling request. APUCCH format 1 a is used to transmit a 1-bit HARQ-ACK. A PUCCH format 1b is used to transmit a 2-bit HARQ-ACK. The PUCCH format 1 b, whichaccompanies a channel selection, is used to transmit an HARQ-ACK of upto 4 bits when two or more serving cells are configured to a terminaldevice. A PUCCH format 3 may be used to transmit an HARQ-ACK only. ThePUCCH format 3 may be used to transmit an HARQ-ACK and a schedulingrequest (a positive scheduling request or a negative schedulingrequest).

The PUSCH is used to transmit uplink data (uplink-shared channel(UL-SCH)). Furthermore, the PUSCH may be used to transmit, along withthe uplink data, the HARQ-ACK and/or channel state information.Furthermore, the PUSCH may be used to transmit only the channel stateinformation or to transmit only the HARQ-ACK and the channel stateinformation.

Here, the base station device 3 and the terminal device 1 exchange(transmit and receive) a signal in a higher layer. For example, the basestation device 3 and the terminal device 1 may transmit and receive anRRC signaling, which is also referred to as a radio resource controlmessage (RRC message) or radio resource control information (RRCinformation), in a radio resource control (RRC) layer. Furthermore, thebase station device 3 and the terminal device 1 may transmit and receivea MAC CF in a medium access control (MAC) layer. Here, the RRC signalingand/or the MAC CE is also referred to as a higher layer signaling.

The PUSCH is used to transmit the RRC signaling and the MAC CE. Here, anRRC signaling transmitted from the base station device 3 may be asignaling common to a plurality of terminal devices 1 within a cell.Furthermore, the RRC signaling transmitted from the base station device3 may be a signaling dedicated to a certain terminal device 1, which isalso referred to as a dedicated signaling. That is, information specificto a user device (user device-specific information) is transmitted to acertain terminal device 1 by using a dedicated signaling.

The PRACH is used to transmit a random access preamble. The PRACH isused for an initial connection establishment procedure, a handoverprocedure, a connection re-establishment procedure, a synchronization(timing adjustment) for uplink transmission, and a request for a PUSCH(UL-SCH) resource.

In FIG. 1, in the uplink radio communication, the following uplinkphysical signal is used. The uplink physical signal is not used totransmit information output from the higher layer, but is used by aphysical layer.

-   -   Uplink reference signal (UL RS)

In the present embodiment, the following two types of uplink referencesignals are used.

-   -   Demodulation reference signal (DMRS)    -   Sounding reference signal (SRS)

The DMRS relates to transmission of the PUSCH or the PUCCH. The DMRS istime-multiplexed with the PUSCH or the PUCCH. The base station device 3uses the DMRS in order to perform channel compensation of the PUSCH orthe PUCCH. Hereinafter, transmission of both of the PUSCH and the DMRSis referred simply to as transmission of the PUSCH. Hereinafter,transmission of both of the PUCCH and the DMRS is referred simply to astransmission of the PUCCH.

The SRS is not related to the transmission of the PUSCH or the PUCCH.The base station device 3 uses the SRS in order to measure an uplinkchannel state.

In FIG, 1, for downlink radio communication from the base station device3 to the terminal device 1, the following downlink physical channels areused. The downlink physical channel is used to transmit the informationoutput from the higher layer.

-   -   Physical broadcast channel (PBCH)    -   Physical control format indicator channel (PCFICH)    -   Physical hybrid automatic repeat request indicator channel        (PHICH)    -   Physical downlink control channel (PDCCH)    -   Enhanced physical downlink control channel (EPDCCH)    -   Physical downlink shared channel (PDSCH)    -   Physical multicast channel (PMCH)

The PBCH is used to broadcast a master information block (MIB), orbroadcast channel (BCH), that is commonly used in the terminal devices1.

The PCFICH is used to transmit information instructing a region (OFDMsymbol) to be used for transmission of the PDCCH.

The PHICH is used to transmit an HARQ indicator (HARQ feedback, responseinformation) indicating an acknowledgement (ACK) or a negativeacknowledgement (HACK) with respect to the uplink data (uplink sharedchannel (UL-SCH)) received by the base station device 3.

The PDCCH and the EPDCCH are used to transmit downlink controlinformation (DCI). The downlink control information is also referred toas DCI format. The downlink control information includes a DCI format 3,a DCI format 3A, a downlink grant, and an uplink grant. The downlinkgrant is also referred to as downlink assignment or downlink allocation.

The downlink grant is used for scheduling of a single PDSCH within asingle cell. The downlink grant is used for the scheduling of the PDSCHwithin the same subframe as the subframe in which the downlink grant istransmitted.

The uplink grant is used for scheduling of a single PUSCH within asingle cell. The uplink grant is used for scheduling of a single PUSCHwithin a fourth or later subframe after the subframe in which the uplinkgrant is transmitted. The uplink grant includes a TPC command for thePUSCH.

CRC parity bits added to the downlink grant or the uplink grant arescrambled with a cell-radio network temporary identifier (C-RNTI) or asemi persistent scheduling cell-radio network temporary identifier (SPSC-RNTI). The C-RNTI and the SPS C-RNTI are identifiers for identifying aterminal device within the cell.

The C-RNTI is used to control the PDSCH or the PUSCH in a singlesubframe. The SPS C-RNTI is used to periodically allocate a resource forthe PDSCH or the PUSCH.

The PDSCH is used to transmit downlink data (downlink shared channel(DL-SCH)).

The PMCH is used to transmit multicast data (multicast channel (MCH)).

In FIG. 1, in the downlink radio communication, the following downlinkphysical signals are used. The downlink physical signal is not used totransmit the information output from the higher layer, but is used bythe physical layer.

-   -   Synchronization signal (SS)    -   Downlink reference signal (DL RS)

The synchronization signal is used in order for the terminal device 1 tobe synchronized in terms of a frequency and time domains for downlink.In the TDD scheme, the synchronization signal is mapped to subframes 0,1, 5, and 6 within a radio frame. In the FDD scheme, the synchronizationsignal is mapped to subframes 0 and 5 within the radio frame.

The downlink reference signal is used in order for the terminal device 1to perform the channel compensation of the downlink physical channel.The downlink reference signal is used in order tor the terminal device 1to calculate the downlink channel state information.

In the present embodiment, the following five types of downlinkreference signals are used.

-   -   Cell-specific reference signal (CRS)    -   UE-specific reference signal (URS) relating to the PDSCH    -   Demodulation reference signal (DMRS) relating to the EPDCCH    -   Non-zero power channel state information-reference signal (NZP        CSI-RS)    -   Zero power channel state information-reference signal (ZP        CSI-RS)    -   Multimedia broadcast and multicast service over single frequency        network reference signal (MBSFN RS)    -   Positioning reference signal (PRS)

The downlink physical channel and the downlink physical signal arecollectively referred to as a downlink signal. The uplink physicalchannel and the uplink physical signal are collectively referred to asan uplink signal. The downlink physical channel and the uplink physicalchannel are collectively referred to as a physical channel. The downlinkphysical signal and the uplink physical signal are collectively referredto as a physical signal.

The BCH, the MCH, the UL-SCH, and the DL-SCH are transport channels. Achannel used in a medium access control (MAC) layer is referred to as atransport channel. A unit of the transport channel used in the MAC layeris referred to as a transport block (TB) or a MAC protocol data unit(PDU). Control of a hybrid automatic repeat request (HARQ) is performedfor each transport block in the MAC layer. The transport block is a unitof data that the MAC layer delivers to the physical layer. In thephysical layer, the transport block is mapped to a codeword, and codingprocessing is performed on a codeword-by-codeword basis.

In the present embodiment, a random access procedure may be performed inthe primary cell and the secondary cell. However, at any point in thetime domain, only one random access procedure is performed. That is, aplurality of random access procedures are not performed simultaneously.

In the primary cell, the PRACH may be transmitted. The terminal device 1receives information regarding the random access procedure in theprimary cell (RRC message) from the base station device 3. Theinformation regarding the random access procedure in the primary cellincludes information indicating a set of PRACH resources in the primarycell.

In the secondary cell, the PRACH may be transmitted. The terminal device1 receives information regarding the random access procedure in thesecondary cell (RRC message) from the base station device 3. Theinformation regarding the random access procedure in the secondary cellincludes information indicating a set of PRACH resources in thesecondary cell.

In the present embodiment, a group of a plurality of serving cells isreferred to as a PUCCH cell group. A certain serving cell belongs to anyone of the PUCCH cell groups.

One PUCCH cell group may include one or a plurality of PUCCH servingcells. One PUCCH cell group may include only one PUCCH serving cell. OnePUCCH cell group may include one PUCCH serving cell and one or aplurality of non-PUCCH serving cells.

A PUCCH cell group including the primary cell is referred to as aprimary PUCCH cell group. A PUCCH cell group that does not include theprimary cell is referred to as a secondary PUCCH cell group. That is,the secondary PUCCH cell group includes a PUCCH secondary cell.

An index (cell group index) for identifying a PUCCH cell group may bedefined.

An index for the primary PUCCH cell group is always 0. An index for thesecondary PUCCH cell group may be configured by a network device (basestation device 3).

PUCCH of the PUCCH serving cell is used to transmit uplink controlinformation (an HARQ-ACK and/or a CSI) for a serving cell (PUCCH servingcell, non-PUCCH serving cell) included in the PUCCH cell group to whichthe PUCCH serving cell belongs.

That is, the uplink control information (an HARQ-ACK and/or a CSI) for aserving cell (PUCCH serving cell, non-PUCCH serving cell) included inthe PUCCH cell group is transmitted by using the PUCCH in a PUCCHserving cell included in the PUCCH cell group.

For example, uplink control information (an HARQ-ACK and/or a CSI) for aserving cell included in the primary PUCCH cell group may be transmittedby using the PUCCH in a PUCCH secondary cell included in the primaryPUCCH cell group.

The PUCCH cell group for the HARQ-ACK and the PUCCH cell group for theCSI may be individually defined. The PUCCH cell group for the HARQ-ACKand the PUCCH cell group for the CSI may be common.

The scheduling request is transmitted in one PUCCH serving cell out of aplurality of PUCCH serving cells. In the plurality of PUCCH servingcells, a plurality of scheduling requests are not transmittedsimultaneously. The scheduling request may be transmitted via the PUCCHin the primary cell. The scheduling request may be transmitted via thePUCCH in the special secondary cell.

In one PUCCH serving cell out of a plurality of PUCCH serving cells, aPUCCH resource for a scheduling request is configured. In the PUCCHresource for a scheduling request, the PUCCH format 1 is transmitted.The uplink subframe including the PUCCH resource (PUCCH format 1) for ascheduling request is referred to as an instance of scheduling requesttransmission. The instance of scheduling request transmission is aperiodic uplink subframe.

The instance of scheduling request transmission is configured by thehigher layer. The base station device 3 transmits information indicatingthe instance of scheduling request transmission (an RRC message) to theterminal device 1. The information indicating the instance of schedulingrequest transmission indicates a period and an offset. The base stationdevice 3 transmits information indicating the serving cell in which thePUCCH resource for the scheduling request is configured, to the terminaldevice 1. The subframe is also referred to as a transmission timeinterval (TTI).

FIG. 2 is a diagram illustrating one example of the PUCCH cell group inthe present embodiment.

In FIG. 2, squares labeled with 200 to 207 each indicate a serving cellto be aggregated. In FIG. 2, a serving cell 200 is the primary cell, andthe serving cells 201 to 207 are the secondary cells, In FIG. 2, theserving cells 200, 202, and 204 are the PUCCH serving cells, and theserving cells 201, 203, 205, 206, and 207 are the non-PUCCH servingcells.

In FIG. 2, the PUCCH cell group for the HARQ-ACK includes a primaryPUCCH cell group 210 and a secondary PUCCH cell group 220. The primaryPUCCH cell group 210 for the HARQ-ACK includes the serving cells 200 to203. The HARQ-ACK for the serving cells 200 to 203 included in theprimary PUCCH cell group 210 for the HARQ-ACK may be transmitted byusing the PUCCH in either the serving cell 200 or 202.

The primary PUCCH cell group 220 for the HARQ-ACK includes the servingcells 204 to 207. The HARQ-ACK for the serving cells 204 to 207 includedin the primary PUCCH cell group 220 for the HARQ-ACK may be transmittedby using the PUCCH in the serving cell 204.

In FIG. 2, the PUCCH cell group for the CSI includes only one primaryPUCCH cell group 230. The primary PUCCH cell group 230 for the CSIincludes the serving cells 200 to 207. The CSI for the serving cells 200to 207 included in the primary PUCCH cell group 230 for the CSI may betransmitted by using the PUCCH in any one of serving cells 200, 202, and204.

In FIG. 2, the SR may be transmitted by using the PUCCH in any one ofthe serving cells 200, 202, and 204.

Processing related to a scheduling request will be described below.

When a scheduling request is triggered, the scheduling request isassumed to be pending until the scheduling request is canceled. When ascheduling request is triggered and there is no other pending schedulingrequest, the terminal device 1 sets a counter SR_COUNTER to 0.

FIG. 3 is a diagram illustrating an example of processing related to ascheduling request to be executed for each of the subframes (TTIs), inthe present embodiment. The processing in FIG. 3 is executed in the MAClayer. The terminal device 1 executes, while at least one schedulingrequest is pending, the processing in FIG. 3 for each of the subframeshaving no UL-SCH available for the transmission. Note that specificprocessing is not limited to the processing in FIG. 3, but also includesprocessing modified by replacing/adding/eliminating, for example, a stepwithout departing from the gist of the present invention. Furthermore,the processing in FIG. 3 may be modified in various forms within thescope of the claims, and embodiments obtained by appropriately combiningtechnical means disclosed also fall within the technical scope of thepresent invention.

In step 300, the terminal device 1 determines whether or not conditionsincluded in a condition 300 are satisfied. In step 300, when theconditions included in the condition 300 are satisfied, the terminaldevice 1 proceeds to step 302. In step 300, when the conditions includedin the condition 300 are not satisfied, the terminal device 1 proceedsto step 304. The condition 300 at least includes a condition that theterminal device 1 does not have a valid PUCCH resource for thescheduling request configured in any subframe. That is, the condition300 at least includes a condition that a PUCCH resource is notconfigured in any serving cell.

In step S302, the terminal device 1 executes processing 302, andproceeds to step 304. The processing 302 at least includes processing ofinitiating the random access procedure on the primary cell andprocessing of canceling all pending scheduling requests.

In step 304, the terminal device 1 determines whether or not conditionsincluded in a condition 304 are satisfied. In step 304, when theconditions included in the condition 304 are satisfied, the terminaldevice 1 proceeds to step 306. In step 304, when the conditions includedin the condition 304 are not satisfied, the terminal device 1 proceedsto step 308. The condition 306 at least includes a condition that theterminal device 1 has the valid PUCCH resource for the schedulingrequest configured in this subframe, and a condition that a secondarycell in which the valid PUCCH resource for the scheduling request isconfigured in the subframe is deactivated. That is, the condition 306 atleast includes a condition that in the subframe, the valid PUCCHresource for the scheduling request is configured in a secondary cell,but the secondary cell is deactivated.

In step S306, the terminal device 1 executes processing 306 and proceedsto step 308. The processing 306 at least includes processing ofinitiating the random access procedure on the primary cell. Theprocessing 306 may further include processing of canceling all pendingscheduling requests. In the processing 306, the terminal device 1 maynot cancel the pending scheduling request. As a result, when thesecondary cell in which the valid PUCCH resource for the schedulingrequest is configured is activated, it is possible to transmit thescheduling request as soon as possible.

In step 308, the terminal device 1 determines whether or not conditionsincluded in a condition 308 are satisfied. In step 308, when theconditions included in the condition 308 are satisfied, the terminaldevice 1 proceeds to step 310. In step 308, when the conditions includedin the condition 308 are not satisfied, the terminal device 1 terminatesthe processing for the TTI. The condition 308 at least includes acondition of having the valid PUCCH resource for the scheduling requestconfigured in this subframe, a condition that this subframe is not apart of a measurement gap, and a condition that a timer sr-ProhibitTimeris not running. Furthermore, the condition 308 may include a conditionthat the serving cell (the primary cell or the secondary cell) in whichthe valid PUCCH resource for the scheduling request is configured inthis subframe is activated. That is, the condition 308 at least includesa condition that in this subframe, the valid PUCCH resource for thescheduling request is configured in the serving cell and the servingcell is activated.

In step 310, the terminal device 1 determines whether or not theconditions included in a condition 310 are satisfied. In step 310, whennone of the conditions included in the condition 310 are satisfied, theterminal device 1 terminates the processing for this TTI. The condition310 includes a condition 3102, a condition 3104, and a condition 3106.

In step 310, when the conditions included in the condition 3102 aresatisfied, the terminal device 1 proceeds to step 312. The condition3102 at least includes a condition that a value of a counter SR_COUNTERis smaller than a prescribed value dsr-TransMax.

In step S312, the terminal device 1 executes processing 312. Theprocessing 312 at least includes processing of incrementing the value ofthe counter SR_COUNTER by 1, processing of notifying/instructing thephysical layer to signal the scheduling request by using the PUCCH, andprocessing of starting the timer sr-ProhibitTimer.

The prescribed value dsr-TransMax may be controlled by the base stationdevice 3. The base station device 3 may transmit information indicatingthe prescribed value dsr-TransMax to the terminal device 1. A defaultvalue of the prescribed value dsr-TransMax may be defined in advance.

In step 310, when the conditions included in the condition 3104 aresatisfied, the terminal device 1 proceeds to step 314. The condition3104 at least includes a condition that the value of the counterSR_COUNTER is equal to the prescribed value dsr-TransMax or larger thanthe prescribed value dsr-TransMax, and a condition that the PUCCHresource for the scheduling request is configured in the primary cell.

In step S314, the terminal device 1 executes processing 314. Theprocessing 314 at least includes processing of notifying/instructing theRRC to release PUCCH/SRS for all serving cells, processing of clearing aconfigured downlink assignment and a configured uplink assignment,processing of initiating the random access procedure on the primarycells, and processing of canceling all pending scheduling requests.Here, the PUCCH for all serving cells may include the PUCCH for the CSI,the PUCCH for the HARQ-ACK, and/or the PUCCH for the scheduling request.Here, the uplink assignment is configured semi-statically.

In step 310, when the conditions included in the condition 3106 aresatisfied, the terminal device 1 proceeds to step 316. The condition3106 at least includes a condition that the value of the counterSR_COUNTER is equal to the prescribed value dsr-TransMax, or larger thanthe prescribed value dsr-TransMax, and a condition that the PUCCHresource for the scheduling request is configured in the secondary cell.

In step S316, the terminal device 1 executes processing 316. Theprocessing 316 at least includes processing of notifying/instructing theRRC to release the PUCCH/SRS for the secondary cell in which the PUCCHresource is configured for the scheduling request, processing ofinitiating the random access procedure on the primary cell, andprocessing of canceling all pending scheduling requests. In theprocessing 316, the configured downlink assignment and the configureduplink assignment may not be cleared. That is, in the processing 316, itmay not be necessary to notify/instruct the RRC to release the PUCCH/SRSfor all serving cells other than the secondary cell in which the PUCCHresource for the scheduling request is configured. Here, the PUCCH forthe secondary cell in which the PUCCH resource for the schedulingrequest is configured may include PUCCH for the CSI, PUCCH for theHARQ-ACK, and/or PUCCH for the scheduling request, Here, the uplinkassignment is configured semi-statically.

The RRC layer releases, on the basis of the notification/instructionfrom the MAC layer, the PUCCH/SRS for all or some serving cells, Thatis, the RRC releases, on the basis of the instruction from the MAClayer, the resource of the PUCCH/SRS for all or some serving cells.

The physical layer signals, on the basis of the notification/instructionfrom the MAC layer, the scheduling request by using the PUCCH.

When only a positive scheduling request is transmitted, the terminaldevice 1 transmits the positive scheduling request by using the PUCCHresource for the scheduling request and the PUCCH format 1.

When SR transmission occurs in a subframe in which the PUCCH format 1a/1 b (PUCCH format 1 a or PUCCH format 1 b) is transmitted, if thescheduling request is a negative scheduling request, the terminal device1 transmits the HARQ-ACK by using the PUCCH resource for the HARQ-ACK.

When SR transmission occurs in a subframe in which the PUCCH format 1a/1 b is transmitted, if the scheduling request is a positive schedulingrequest and the HARQ-ACK and the SR are transmitted in different servingcells, the terminal device 1 may transmit the positive schedulingrequest by using the PUCCH resource for the scheduling request and thePUCCH format 1, and may transmit the HARQ-ACK by using the PUCCHresource for the HARQ-ACK.

When SR transmission occurs in a subframe in which the PUCCH format 1a/1 b is transmitted, if the scheduling request is a positive schedulingrequest and the HARQ-ACK and the SR are transmitted in different servingcells, the terminal device 1 may transmit the positive schedulingrequest by using the PUCCH resource for the scheduling request and thePUCCH format 1, and may drop the transmission of the HARQ-ACK.

When SR transmission occurs in a subframe in which the PUCCH format 1a/1 b is transmitted, if the scheduling request is a positive schedulingrequest and the HARQ-ACK and the SR are transmitted in different servingcells, the terminal device 1 may drop the transmission of the positivescheduling request and transmit the HARQ-ACK by using the PUCCH resourcefor the HARQ-ACK.

When SR transmission occurs in a subframe in which the PUCCH format 1a/1 b is transmitted, if the scheduling request is a positive schedulingrequest and both the HARQ-ACK and the SR are transmitted in the sameserving cells, the terminal device 1 may transmit the HARQ-ACK by usingthe PUCCH resource for the scheduling request.

When SR transmission occurs in a subframe in which the PUCCH format 1 baccompanying a channel selection is transmitted, if the schedulingrequest is a negative scheduling request, the terminal device 1transmits the HARQ-ACK by using the PUCCH resource for the HARQ-ACK.

When SR transmission occurs in a subframe in which the PUCCH format 1 baccompanying the channel selection is transmitted, if the schedulingrequest is a positive scheduling request and the HARQ-ACK and the SR aretransmitted in different serving cells, the terminal device 1 maytransmit the positive scheduling request by using the PUCCH resource forthe scheduling request and the PUCCH format 1 and transmit the HARQ-ACKby using the PUCCH resource for the HARQ-ACK.

When SR transmission occurs in a subframe in which the PUCCH format 1 baccompanying the channel selection is transmitted, if the schedulingrequest is a positive scheduling request and the HARQ-ACK and the SR aretransmitted in different serving cells, the terminal device 1 maytransmit the positive scheduling request by using the PUCCH resource forthe scheduling request and the PUCCH format 1 and drop the transmissionof HARQ-ACK.

When SR transmission occurs in a subframe in which the PUCCH format 1 baccompanying the channel selection is transmitted, if the schedulingrequest is a positive scheduling request and the HARQ-ACK and the SR aretransmitted in different serving cells, the terminal device 1 may dropthe transmission of the positive scheduling request, and transmit theHARQ-ACK by using the PUCCH resource for the HARQ-ACK.

When SR transmission occurs in a subframe in which the PUCCH format 1 baccompanying the channel selection is transmitted, if the schedulingrequest is a positive scheduling request and both the HARQ-ACK and theSR are transmitted in the same serving cells, the terminal device 1 maytransmit 1-bit HARQ-ACK (HARQ-ACK indicated by using 1 bit ofinformation bit, 1-bit HARQ-ACK) for each serving cell by using thePUCCH resource for the scheduling request. That is, for example, when2-bit (b(0), b(1)) information bits are transmitted by using the PUCCHresource for the scheduling request, each of the 2-bit (b(0), b(1))information bits corresponds to one serving cell.

Here, when only one transport block, or only the PDCCH/EPDCCHinstructing one downlink semi persistent scheduling (SPS) release isdetected in a serving cell, 1 bit of the HARQ-ACK for the serving cellis a bit of the HARQ-ACK corresponding to the one transport block or thePDCCH/EPDCCH instructing the one downlink SPS release. Here, when twotransport blocks are received in a serving cell, 1 bit of the HARQ-ACK.for the serving cell is created by spatially bundling two HARQ-ACK bitscorresponding to the two transport blocks, The bundling is executed by alogical OR operation. Here, when both PDSCH transmission provided withthe HARQ-ACK response and the PDCCH/EPDCCH instructing the downlink SPSrelease are not detected for the serving cell, the HARQ-ACK bit for theserving cell is set as NACK.

When the two PUCCH cell groups are configured for the terminal device 1,the PUCCH format 1 b accompanying the channel selection is configuredfor each of the two PUCCH cell groups, and SR transmission occurs in asubframe in which the PUCCH format 1 b accompanying the channelselection is transmitted, if the scheduling request is a positivescheduling request, the terminal device 1 may transmit 1 bit of HARQ-ACKfor each PUCCH cell group by using the PUCCH resource for the schedulingrequest. That is, for example, when 2-bit (b(0), b(1)) information bitsare transmitted by using the PUCCH resource for the scheduling request,each of the 2-bit (b(0), b(1)) information bits corresponds to one PUCCHcell group.

In a scheduling request transmission instance in which signaling of thescheduling request by using the PUCCH is instructed from the MAC layer,the scheduling request transmission instance not accompanying the PUSCH,upon occurrence of transmission of the HARQ-ACK using the PUCCH format 3in the PUCCH serving cell in which the PUCCH resource for the schedulingrequest is configured, the PUCCH resource for the HARQ-ACK and the PUCCHformat 3 in the PUCCH serving cell in which the PUCCH resource for thescheduling request is configured are used to transmit both the HARQ-ACKand the scheduling request.

In a scheduling request transmission instance in which signaling of thescheduling request by using the PUCCH is instructed from the MAC layer,the scheduling request transmission instance not accompanying the PUSCH,upon occurrence of transmission of the HARQ-ACK using the PUCCH format 3in the PUCCH serving cell other than the PUCCH serving cell in which thePUCCH resource for the scheduling request is configured, it may bepossible to simultaneously perform transmission of the HARQ-ACK usingthe PUCCH resource for the HARQ-ACK and the PUCCH format 3 in the PUCCHserving cell other than the PUCCH serving cell in which the PUCCHresource for the scheduling request is configured, and transmission ofthe positive scheduling request using the PUCCH resource for thescheduling request and the PUCCH format 1 in the PUCCH serving cell inwhich the PUCCH resource for the scheduling request is configured.

In a scheduling request transmission instance in which signaling of thescheduling request by using the PUCCH is instructed from the MAC layer,the scheduling request transmission instance not accompanying the PUSCH,upon occurrence of transmission of the HARQ-ACK using the PUCCH format 3in the PUCCH serving cell other than the PUCCH serving cell in which thePUCCH resource for the scheduling request is configured, transmission ofthe HARQ-ACK using the PUCCH resource for the HARQ-ACK and the PUCCHformat 3 in the PUCCH serving cell other than the PUCCH serving cell inwhich the PUCCH resource for the scheduling request is configured, maybe performed, and transmission of the positive scheduling request usingthe PUCCH resource for the scheduling request and the PUCCH format 1 inthe PUCCH serving cell in which the PUCCH resource for the schedulingrequest is configured, may be dropped.

In a scheduling request transmission instance in which signaling of thescheduling request by using the PUCCH is instructed from the MAC layer,the scheduling request transmission instance not accompanying the PUSCH,upon occurrence of transmission of the HARQ-ACK using the PUCCH resourcefor the HARQ-ACK and the PUCCH format 3 in the PUCCH serving cell otherthan the PUCCH serving cell in which the PUCCH resource for thescheduling request is configured, transmission of the HARQ-ACK using thePUCCH format 3 in the PUCCH serving cell other than the PUCCH servingcell in which the PUCCH resource for the scheduling request isconfigured, may be dropped, and transmission of the positive schedulingrequest using the PUCCH resource for the scheduling request and thePUCCH format 1 in the PUCCH serving cell in which the PUCCH resource forthe scheduling request is configured, may be performed.

In a scheduling request transmission instance in which signaling of thescheduling request by using the PUCCH is instructed from the MAC layer,the scheduling request transmission instance not accompanying the PUSCH,upon occurrence of transmission of the HARQ-ACK using the PUCCH format 3in the PUCCH serving cell other than the PUCCH serving cell in which thePUCCH resource for the scheduling request is configured, both theHARQ-ACK and the scheduling request in the PUCCH serving cell other thanthe PUCCH serving cell in which the PUCCH resource for the schedulingrequest is configured are transmitted by using the PUCCH resource forthe HARQ-ACK and the PUCCH format 3.

Activation and deactivation of the serving cell according to the presentembodiment will be described, below.

The primary cell is always activated. A network (base station device 3)is capable of activating and deactivating a configured secondary cell bytransmitting an activated/deactivated medium access control (MAC)control element (CE). The terminal device 1 activates, on the basis ofreception of an activated/deactivated MAC CE instructing activation of aconfigured serving cell, the configured secondary cell. The terminaldevice 1 deactivates, on the basis of reception an activated/deactivatedMAC CE instructing deactivation of a configured serving cells, theconfigured secondary cell. The terminal device 1 includes asCellDeactivationTimer for each configured secondary cell, and when thesCellDeactivationTimer expires, the terminal device 1 deactivates therelated secondary cell.

The terminal device 1 applies, to an activated secondary cell, (1)monitoring of PDCCH in the activated secondary cell, (2) monitoring ofPDCCH for the activated secondary cell, (3) transmission of an SRS inthe deactivated secondary cell, and (4) a normal secondary celloperation including reporting of a CSI for the deactivated secondarycell.

When a secondary cell is deactivated, the terminal device 1 does not:(1) monitor PDCCH in the deactivated secondary cell; (2) monitor PDCCHfor the deactivated secondary cell; (3) transmit an SRS in thedeactivated secondary cell; (4) report a CSI for the deactivatedsecondary cell; (5) transmit the UL-SCH in the deactivated secondarycell; (6) transmit PRACH in the deactivated secondary cell; and (7)transmit a scheduling request in the deactivated secondary cell.

The PUCCH secondary cell in which the PUCCH resource for the schedulingrequest is configured may be always activated. That is, theactivated/deactivated MAC CE and the sCellDeactivationTimer may not beapplied to the PUCCH secondary cell in which the PUCCH resource for thescheduling request is configured. The activated/deactivated MAC CE andthe sCellDeactivationTimer are applied to the PUCCH secondary cell inwhich the PUCCH resource for the scheduling request is not configured.

That is, when the PUCCH resource for the scheduling request isconfigured in the PUCCH secondary cell, the activated/deactivated MAC CEand the sCellDeactivationTimer may not be applied to the PUCCH secondarycell. In the PUCCH secondary cell, when the PUCCH resource for thescheduling request is not configured and the PUCCH resource for theHARQ-ACK and/or the CSI is configured, the activated/deactivated MAC CEand the sCellDeactivationTimer may be applied to the PUCCH secondarycell.

That is, in the secondary cell, when the PUCCH resource for thescheduling request is configured, the activated/deactivated MAC CE andthe sCellDeactivationTimer may not be applied to the secondary cell. Inthe secondary cell, when the PUCCH resource for the scheduling requestis not configured, the activated/deactivated MAC CE and thesCellDeactivationTimer may be applied to the secondary cell.

Furthermore, the secondary cell in which the PUCCH resource for thescheduling request, the HARQ-ACK, and/or the CSI is configured may bealways activated.

That is, in the secondary cell, when the PUCCH resource for thescheduling request, the HARQ-ACK, and/or the CSI is configured, theactivated/deactivated MAC CE and the sCellDeactivationTimer may not beapplied to the secondary cell. In the secondary cell, when the PUCCHresource for the scheduling request, the HARQ-ACK, and the CSI is notconfigured, the activated/deactivated MAC CE and thesCellDeactivationTimer may be applied to the secondary cell.

Furthermore, the PUCCH secondary cell in which the PUCCH resource forthe scheduling request is configured, may be deactivated on the basis ofthe activated/deactivated MAC CE and the sCellDeactivationTimer.

A constitution of a device according to the present embodiment will bedescribed below.

FIG. 4 is a schematic block diagram illustrating the constitution of theterminal device 1 according to the present embodiment. As illustrated inthe figure, the terminal device 1 is constituted to include a radiotransmission/reception unit 10 and a higher layer processing unit 14.The radio transmission/reception unit 10 is constituted to include anantenna unit 11, a radio frequency (RF) unit 12, and a baseband unit 13.The higher layer processing unit 14 is constituted to include a mediumaccess control layer processing unit 15 and a radio resource controllayer processing unit 16. The radio transmission/reception unit 10 isalso referred to as a transmission unit, a reception unit, or a physicallayer processing unit.

The higher layer processing unit 14 outputs uplink data (transportblock) generated by a user operation or the like, to the radiotransmission/reception unit 10. The higher layer processing unit 14performs processing of the medium access control (MAC) layer, a packetdata convergence protocol (PDCP) layer, a radio link control (RLC)layer, and a radio resource control (RRC) layer.

The medium access control layer processing unit 15 provided in thehigher layer processing unit 14 performs processing of the medium accesscontrol layer. The medium access control layer processing unit 15controls, on the basis of various types of configuration informationparameters managed by the radio resource control layer processing unit16, to transmit a scheduling request.

The radio resource control layer processing unit 16 provided in thehigher layer processing unit 14 performs processing of the radioresource control layer. The radio resource control layer processing unit16 manages various types of configuration information/parameters of theterminal device 1 itself. The radio resource control layer processingunit 16 sets the various types of configuration information/parameterson the basis of a higher layer signal received from the base stationdevice 3. Specifically, the radio resource control layer processing unit16 sets the various types of configuration information/parameters on thebasis of information indicating the various types of configurationinformation/parameters received from the base station device 3.

The radio transmission/reception unit 10 performs processing, such asmodulation, demodulation, coding, and decoding, of the physical layer.The radio transmission/reception unit 10 demultiplexes, demodulates, anddecodes a signal received from the base station device 3, and outputsthe decoded information to the higher layer processing unit 14. Theradio transmission/reception unit 10 modulates and codes data togenerate a transmit signal, and transmits the transmit signal to thebase station device 3.

The RF unit 12 converts (down-converts) a signal received through theantenna unit 11 into a baseband signal by orthogonal demodulation andremoves an unnecessary frequency component. The RF unit 12 outputs ananalog signal thus processed to the baseband unit.

The baseband unit 13 converts the analog signal input from the RF unit12 into a digital signal. The baseband unit 13 removes a portioncorresponding to a cyclic prefix (CP) from the digital signal resultingfrom the conversion, performs fast Fourier transform (FFT) on the signalfrom which the CP has been removed, and extracts a signal in thefrequency domain.

The baseband unit 13 performs inverse fast Fourier transform (IFFT) ondata, generates an SC-FDMA symbol, attaches a CP to the generatedSC-FDMA symbol, generates a digital signal in a baseband, and convertsthe digital signal in the baseband into an analog signal. The basebandunit 13 outputs the analog signal resulting from the conversion, to theRF unit 12.

The RF unit 12 uses a low-pass filter to remove an unnecessary frequencycomponent from the analog signal input from the baseband unit 13,up-converts the analog signal into a signal of a carrier frequency, andtransmits the up-converted signal via the antenna unit 11. Furthermore,the RF unit 12 amplifies the electrical power, In addition, the RF unit12 may be provided with a function of controlling transmit power. The RFunit 12 is also referred to as a transmission power control unit.

FIG. 5 is a schematic block diagram illustrating a constitution of thebase station device 3 according to the present embodiment. Asillustrated in the figure, the base station device 3 is constituted toinclude a radio transmission/reception unit 30 and a higher layerprocessing unit 34. The radio transmission/reception unit 30 isconstituted to include an antenna unit 31, an RF unit 32, and a basebandunit 33. The higher layer processing unit 34 is constituted to include amedium access control layer processing unit and a radio resource controllayer processing unit 36. The radio transmission/reception unit 30 isalso referred to as a transmission unit, a reception unit, or a physicallayer processing unit.

The higher layer processing unit 34 performs processing of the mediumaccess control (MAC) layer, the packet data convergence protocol (PDCP)layer, the radio link control (RLC) layer, and the radio resourcecontrol (RRC) layer.

The medium access control layer processing unit 35 provided in thehigher layer processing unit 34 performs processing of the medium accesscontrol layer. The medium access control layer processing unit 35performs, on the basis of various types of setting information/parameters managed by the radio resource control layer processing unit36, processing related to the scheduling request.

The radio resource control layer processing unit 36 provided in thehigher layer processing unit 34 performs processing of the radioresource control layer. The radio resource control layer processing unit36 generates, or acquires from a higher node, downlink data (transportblock) arranged on a physical downlink shared channel, systeminformation, an RRC message, a MAC control element (CE), and the like,and outputs a result of the generation or the acquirement to the radiotransmission/reception unit 30. Furthermore, the radio resource controllayer processing unit 36 manages various types of configurationinformation/parameters for each of the terminal devices 1. The radioresource control layer processing unit 36 may set various types ofconfiguration information/parameters for each of the terminal devices 1via a higher layer signal. That is, the radio resource control layerprocessing unit 36 transmits/broadcasts information indicating varioustypes of configuration information/parameters.

A function of the radio transmission reception unit 30 is similar tothat of the radio transmission/reception unit 10, and hence descriptionthereof is omitted.

(1) A terminal device according to the present embodiment is a terminaldevice configured to communicate with a base station device by using twoserving cells including one primary cell. The device may include: areception unit configured to receive information indicating a parameterabout a random access procedure on the primary cell, informationindicating a parameter about a random access procedure on a serving cellother than the primary cell, and information indicating a resource for aphysical uplink control channel for a scheduling request, in the servingcell other than the primary cell; a transmission unit configured totransmit a scheduling request used for requesting an uplink sharedchannel (UL-SCH) resource for an initial transmission, via the physicaluplink control channel, in the serving cell other than the primary cell;and a MAC layer processing unit configured to increment a value of acounter by 1 and instruct the transmission unit to transmit thescheduling request via the physical uplink control channel in theserving cell other than the primary cell, in a first case, in which acondition is satisfied that includes at least conditions that at leastone scheduling request is pending in a certain transmission timeinterval (TTI), there is no UL-SCH resource available for transmissionin the certain TTI, and the terminal device has a valid resource for thephysical uplink control channel for the scheduling request configuredfor the certain TTI, when the value of the counter is smaller than aprescribed value, and configured to initiate a random access procedureon the primary cell, to release the resource for the physical uplinkcontrol channel for the scheduling request in the serving cell otherthan the primary cell, and to cancel all pending scheduling requests, inthe first case when the value of the counter is equal to the prescribedvalue or larger than the prescribed value.

(2) A terminal device according to the present embodiment is a terminaldevice configured to communicate with a base station device by using twoserving cells including one primary cell. The device may include: areception unit configured to receive information indicating a parameterabout a random access procedure on the primary cell, informationindicating a parameter about a random access procedure on a serving cellother than the primary cell, and information indicating a resource for aphysical uplink control channel for a scheduling request, in the servingcell other than the primary cell; a transmission unit configured totransmit a scheduling request used for requesting an uplink sharedchannel (UL-SCH) resource for an initial transmission, via the physicaluplink control channel, in the serving cell other than the primary cell;and a MAC layer processing unit configured to initiate the random accessprocedure on the primary cell and cancel all pending schedulingrequests, in a first case, in which a condition is satisfied thatincludes at least conditions that at least one scheduling request ispending in a certain transmission time interval (TTI), there is noUL-SCH resource available for transmission in the certain TTI, theterminal device has a valid resource for the physical uplink controlchannel for the scheduling request configured for the certain TTI, andthe serving cell other than the primary cell is deactivated.

(3) A terminal device according to the present embodiment is a terminaldevice configured to communicate with a base station device by using twoserving cells including one primary cell. The device may include: atransmission unit configured to transmit a scheduling request used forrequesting an uplink shared channel (UL-SCH) resource for an initialtransmission, via the physical uplink control channel, in the primarycell or in a serving cell other than the primary cell; and a MAC layerprocessing unit configured to increment a value of a counter by 1 and toinstruct the transmission unit to transmit a scheduling request via thephysical uplink control channel in the primary cell or in the servingcell other than the primary cell, in a case, in which a condition issatisfied that includes at least conditions that at least one schedulingrequest is pending in a certain transmission time interval (TTI), thereis no UL-SCH resource available for transmission in the certain TTI, theterminal device has a valid resource for the physical uplink controlchannel for the scheduling request configured, in the primary cell orthe serving cell other than the primary cell, for the certain TTI, whenthe value of the counter is smaller than a prescribed value, configuredto instruct RRC to release the physical uplink control channel for allserving cells, in a case, in which a condition is satisfied thatincludes at least conditions that at least one scheduling request ispending in the certain TTI, there is no UL-SCH resource available fortransmission in the certain TTI, and the terminal device has the validresource for the physical uplink control channel for the schedulingrequest configured, in the primary cell, for the certain TTI, when thevalue of the counter is equal to the prescribed value or larger than theprescribed value, and configured to instruct the RRC to release thephysical uplink control channel for the serving cell other than theprimary cell, in a case, in which a condition is satisfied that includesat least conditions that at least one scheduling request is pending inthe certain TTI, there is no UL-SCH resource available for transmissionin the certain TTI, and the terminal device has the valid resource forthe physical uplink control channel for the scheduling requestconfigured, in the serving cell other than the primary cell, for thecertain TTI, when the value of the counter is equal to the prescribedvalue or larger than the prescribed value.

(4) The MAC layer processing unit provided in the terminal deviceaccording to the present embodiment may not release the physical uplinkcontrol channel for the primary cell in a case in which a condition issatisfied that includes at least conditions that at least one schedulingrequest is pending in a certain TTI, there is no UL-SCH resourceavailable for transmission in the certain TTI, and the terminal devicehas a valid resource for the physical uplink control channel for thescheduling request configured, in the serving cell other than theprimary cell, for the certain TTI, when the value of the counter isequal to the prescribed value or larger than the prescribed value.

(5) A terminal device according to the present embodiment is a terminaldevice configured to communicate with a base station device by using twoserving cells including one primary cell. The device may include: atransmission unit configured to transmit a scheduling request used forrequesting an uplink shared channel (UL-SCH) resource for an initialtransmission, via the physical uplink control channel, in the primarycell or in a serving cell other than the primary cell; and a MAC layerprocessing unit configured to increment a value of a counter by 1 and toinstruct the transmission unit to transmit the scheduling request viathe physical uplink control channel in the primary cell or in theserving cell other than the primary cell, in a first case, in which acondition is satisfied that includes at least conditions that at leastone scheduling request is pending in a certain transmission timeinterval (TTI), there is no UL-SCH resource available for transmissionin the certain TTI, the terminal device has a valid resource for thephysical uplink control channel for the scheduling request configured inthe primary cell or in the serving cell other than the primary cell, forthe certain TTI, when the value of the counter is smaller than aprescribed value, configured to instruct RRC to release the physicaluplink control channel for all serving cells, in a case, in which acondition is satisfied that includes at least conditions that at leastone scheduling request is pending in a certain there is no UL-SCHresource available for transmission in the certain TTI, and the terminaldevice has a valid resource for the physical uplink control channel forthe scheduling request configured, in the primary cell, for the certainTTI, when the value of the counter is equal to the prescribed value orlarger than the prescribed value, and configured to instruct the RRC torelease the physical uplink control channel for the serving cell otherthan the primary cell, in a case, in which a condition is satisfied thatincludes at least conditions that at least one scheduling request ispending in a certain TTI, there is no UL-SCH resource available fortransmission in the certain TTI, and the terminal device has a validresource for the physical uplink control channel for the schedulingrequest configured, in the serving cell other than the primary cell, forthe certain TTI, when the value of the counter is equal to theprescribed value or larger than the prescribed value.

(6) A terminal device according to the present embodiment is a terminaldevice configured to communicate with a base station device by using twoserving cells including one primary cell. The device may include: atransmission unit configured to transmit a scheduling request used forrequesting an uplink shared channel (UL-SCH) resource for an initialtransmission, via the physical uplink control channel, in the primarycell or in a serving cell other than the primary cell; and a MAC layerprocessing unit configured to increment a value of a counter by 1 andinstruct the transmission unit to transmit the scheduling request viathe physical uplink control channel in the primary cell or in theserving cell other than the primary cell, in a case, in which acondition is satisfied that includes at least conditions that at leastone scheduling request is pending in a certain transmission timeinterval (TTI), there is no UL-SCH resource available for transmissionin the certain TTI, and the terminal device has a valid resource for thephysical uplink control channel for the scheduling request configured inthe primary cell or in a serving cell other than the primary cell, forthe certain TTI, when the value of the counter is smaller than aprescribed value, configured to clear a configured downlink assignmentand a configured uplink grant in a case in which a condition issatisfied that includes at least conditions that at least one schedulingrequest is pending in a certain TTI, there is no UL-SCH resourceavailable for transmission in the certain TTI, and the terminal devicehas a valid resource for the physical uplink control channel for thescheduling request configured, in the primary cell, for the certain TTI,when the value of the counter is equal to the prescribed value or largerthan the prescribed value, and configured to not clear the configureddownlink assignment and the configured uplink grant in a case in which acondition is satisfied that includes at least conditions that at leastone scheduling request is pending in a certain TTI, there is no UL-SCHresource available for transmission in the certain TTI, and the terminaldevice has a valid resource for the physical uplink control channel forthe scheduling request configured, in the serving cell other than theprimary cell, for the certain TTI, when the value of the counter isequal to the prescribed value or larger than the prescribed value.

(7) A terminal device according to the present embodiment is a terminaldevice configured to communicate with a base station device by using twoserving cells including one primary cell. The device may include: atransmission unit configured to transmit a physical uplink controlchannel in each of the primary cell and the serving cell other than theprimary cell; and a MAC layer processing unit configured to activate anddeactivate, on the basis of a MAC control element, the serving cellother than the primary cell, when a resource for the physical uplinkcontrol channel for a scheduling request used for requesting an uplinkshared channel (UL-SCH) resource for an initial transmission is notconfigured, in the serving cell other than the primary cell. When theresource for the physical uplink control channel for the schedulingrequest is configured in the serving cell other than the primary cell,the serving cell other than the primary cell may be always activated.

(8) A base station device according to the present embodiment is aterminal device configured to communicate with a terminal device byusing two serving cells including one primary cell. The device mayinclude: a reception unit configured to receive a physical uplinkcontrol channel in each of the primary cell and the serving cell otherthan the primary cell; and a MAC layer processing unit configured toactivate and deactivate, by transmitting a MAC control element, theserving cell other than the primary cell, when a resource for thephysical uplink control channel for a scheduling request used forrequesting an uplink shared channel (UL-SCH) resource for an initialtransmission is not configured, in the serving cell other than theprimary cell. When the resource for the physical uplink control channelfor the scheduling request is configured in the serving cell other thanthe primary cell, the serving cell other than the primary cell may bealways activated.

As a result, the terminal device 1 is capable of efficientlycommunicating with the base station device 3.

A program operating on the base station device 3 and the terminal device1 according to the present invention may be a program that controls acentral processing unit (CPU) and the like (a program for causing acomputer to function) to realize the functions according to theabove-described embodiment of the present invention. The informationhandled in these devices is temporarily accumulated in a random accessmemory (RAM) while being processed. Thereafter, the information isstored in various types of read only memories (ROMs) such as a flash ROMand a hard disk drive (HDD) and, when necessary, is read by the CPU tobe modified or rewritten.

Note that the terminal device 1 and the base station device 3 accordingto the above-described embodiment may be partially realized by thecomputer. This configuration may be realized by recording a program forrealizing such control functions on a computer-readable medium andcausing a computer system to read the program recorded on the recordingmedium for execution.

Moreover, the “computer system” used herein is defined as a computersystem built into the terminal device 1 or the base station device 3,and the computer system includes an OS and hardware components such as aperipheral device. Furthermore, the “computer-readable recording medium”refers to a portable medium such as a flexible disk, a magneto-opticaldisk, a ROM, and a CD-ROM, and a storage device such as a hard diskbuilt into the computer system.

Moreover, the “computer-readable recording medium” may include a mediumthat dynamically retains the program for a short period of time, such asa communication line that is used to transmit the program over a networksuch as the Internet or over a communication line such as a telephoneline, and a medium that retains, in that case, the program for a certainperiod of time, such as a volatile memory within the computer systemwhich functions as a server or a client. Furthermore, the program may beconfigured to realize some of the functions described above, andadditionally may be configured to be capable of realizing the functionsdescribed above in combination with a program already recorded in thecomputer system.

Furthermore, the base station device 3 according to the above-describedembodiment can be realized as an aggregation (a device group)constituted of a plurality of devices. Devices constituting the devicegroup may be each equipped with some or all portions of each function oreach functional block of the base station device 3 according to theabove-described embodiment. It is only required that the device groupitself include general functions or general functional blocks of thebase station device 3. Furthermore, the terminal device 1 according tothe above-described embodiment is also capable of communicating with thebase station device as the aggregation.

Furthermore, the base station device 3 according to the above-describedembodiment may be an Evolved Universal Terrestrial Radio Access Network(EUTRAN). Furthermore, the base station device 3 according to theabove-described embodiment may have some or all portions of the functionof a node higher than an eNodeB.

Furthermore, some or all portions of each of the terminal device 1 andthe base station device 3 according to the above-described embodimentmay be realized as an LSI that is a typical integrated circuit or may berealized as a chip set. The functional blocks of each of the terminaldevice 1 and the base station device 3 may be individually realized as achip, or some or all of the functional blocks may be integrated into achip. Furthermore, a circuit integration technique is not limited to theLSI, and the integrated circuit may be realized with a dedicated circuitor a general-purpose processor. Furthermore, if with advances in thesemiconductor technology, a circuit integration technology with which anLSI is replaced appears, it is also possible to use an integratedcircuit based on the technology.

Furthermore, according to the above-described embodiment, the terminaldevice is described as one example of a communication device, but thepresent invention is not limited to this, and can be applied to afixed-type electronic apparatus installed indoors or outdoors, or astationary-type electronic apparatus, for example, a terminal device ora communication device, such as an audio-video (AV) apparatus, a kitchenapparatus, a cleaning or washing machine, an air-conditioning apparatus,office equipment, a vending machine, and other household apparatuses.

The embodiment of the present invention has been described in detailabove referring to the drawings, but the specific constitution is notlimited to the embodiment and includes, for example, an amendment to adesign that falls within the scope that does not depart from the gist ofthe present invention. Furthermore, various modifications are possiblewithin the scope of claims, and embodiments that are made by suitablycombining technical means disclosed according to the differentembodiments are also included in the technical scope of the presentinvention. Furthermore, a constitution in which a constituent elementthat achieves the same effect is substituted for the one that isdescribed according to the embodiment is also included in the technicalscope of the present invention.

INDUSTRIAL APPLICABILITY

One aspect of the present invention can be applied to a terminal devicethat needs to effectively communicate with a base station device byusing a plurality of cells, an integrated circuit, a communicationmethod, and the like.

REFERENCE SIGNS LIST

-   1 (1A, 1B, 1C) Terminal device-   3 Base station device-   10 Radio transmission/reception unit-   11 Antenna unit-   12 RF unit-   13 Baseband unit-   14 Higher layer processing unit-   15 Medium access control layer processing unit-   16 Radio resource control layer processing unit-   30 Radio transmission/reception unit-   31 Antenna unit-   32 RF unit-   33 Baseband unit-   34 Higher layer processing unit-   35 Medium access control layer processing unit-   36 Radio resource control layer processing unit

1-6. (canceled)
 7. A terminal apparatus comprising: MAC (Medium AccessControl) layer processing circuitry configured to and/or programmed toinitiate a random access procedure on a first serving cell, and initiatea random access procedure on a second serving cell, and in a case inwhich at least one scheduling request is pending, no UL-SCH (uplinkshared channel) resources are available for a transmission, a PUCCH(Physical Uplink Control Channel) resource for the scheduling request isconfigured only on the second serving cell, the second cell isactivated, and a value of a counter is smaller than a predeterminedvalue, increment the value of the counter by 1 and instruct transmissioncircuitry to transmit the scheduling request on the PUCCH; andtransmission circuitry configured to and/or programmed to transmit thescheduling request on the PUCCH on the second serving cell, wherein theMAC layer processing circuitry is further configured to and/orprogrammed to, in a case in which at least one scheduling request ispending, no UL-SCH resources are available for the transmission, thePUCCH resource for the scheduling request is configured only on thesecond serving cell, and the second serving cell is deactivated,initiate the random access procedure on the first serving cell out ofthe first serving cell and the second serving cell, the first servingcell being indicated in a handover procedure and the PUCCH resource forthe scheduling request being configured on the second serving cell. 8.The terminal apparatus according to claim 7, wherein the MAC layerprocessing circuitry is configured to and/or programmed to, in a case inwhich at, least one scheduling request is pending, no UL-SCH resourcesare available for the transmission, the PUCCH resource for thescheduling request is configured only on the second serving cell, andthe second serving cell is deactivated, cancel all pending schedulingrequests.
 9. The terminal apparatus according to claim 7, wherein thescheduling request is used for requesting UL-SCH resources for a newtransmission.
 10. A communication method of a terminal apparatus, thecommunication method comprising: initiating a random access procedure ona first serving cell, and initiating a random access procedure on asecond serving cell; incrementing the value of the counter by 1 andinstructing transmission circuitry included in the terminal apparatus totransmit the scheduling request on the PUCCH, in a case in which atleast one scheduling request is pending, no UL-SCH (uplink sharedchannel) resources are available tor a transmission, a PUCCH (PhysicalUplink Control Channel) resource for the scheduling request isconfigured only on the second serving cell, the second serving cell isactivated, and a value of a counter is smaller than a predeterminedvalue; transmitting the scheduling request on the PUCCH on the secondarycell; and initiating the random access procedure on the first servingcell out of the first serving cell and the second serving cell, thefirst serving cell being indicated in a handover procedure and the PUCCHresource for the scheduling request being configured on the secondserving cell, in a case in which at least one scheduling request ispending, no UL-SCH resources are available for the transmission, thePUCCH resource for the scheduling request s configured only on thesecond serving cell, and the second serving cell is deactivated.